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Stories, updates, insights, and original analysis from The Planetary Society.

Planetary Society Advent Calendar for December 2: Mathilde

253 Mathilde is the largest asteroid that has ever been visited by a spacecraft. It's held that distinction for more than twelve years, but next year it'll be upstaged by the considerably larger 21 Lutetia, which Rosetta will fly by on July 10.

Saturn's aurora, even better than before

The Cassini imaging team have posted their own processed and captioned version of the Saturn's aurora movie that I posted a preview of about six weeks ago, and it was worth the wait.

Encouraging motion on Spirit

It really looks like the second attempt at driving Spirit out of the trap has had the hoped-for result: some forward progress (maybe about a centimeter), and no evidence for further downward sinking.

Rosetta Earth swingby successful

Rosetta appears to have operated flawlessly as it streaked past Earth for its flyby early this morning. Here are a few more gems from the flyby.

Crescent Earth

Just hours away from its Earth flyby, Rosetta is busily snapping images and gathering other science data.

Four moons and a ring

Thanks to Mike Malaska for the tip on this one. The image is part of an animation that ends with Rhea transiting Saturn.

Cassini's Enceladus encounter, with bonus Tethys

Raw images from Cassini's close pass by Enceladus today started appearing on the JPL raw images website, and some less-compressed versions of a few of them showed up on the CICLOPS website.

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